To align with changes to global chemical labelling regulations1, we are updating the hazard codes which appear in the confidential instructions of Cambridge science practical exams. These changes have been in effect since 2016.
These changes will not affect candidates as hazard codes do not appear on question papers, nor are candidates expected to recall such information in their answers.
Please remind candidates that all substances in science practical exams should be treated with caution. ‘Hazard Data Sheets’ for materials used in the exams should be available from your chemical supplier. You should carry out appropriate risk assessments to ensure that local regulations relating to safety, first-aid and disposal of chemicals are followed.
We will update science syllabuses with the new hazard codes as each syllabus undergoes its regular review process. We will use the new hazard codes where relevant and in accordance with information provided by CLEAPSS2.
- C = corrosive
- MH = moderate hazard
- HH = health hazard
- T = acutely toxic
- F = flammable
- O = oxidising
- N = hazardous to the aquatic environment
- United Nations Global Harmonised System (GHS) for hazard classification and compatible labelling
- An advisory service providing support in practical science and technology for schools and colleges (cleapss.org.uk).
For more information and materials on this syllabus, please visit our "FAQs for AS & A Level Science Practical Exams" and the School Support Hub here.
